THE CANADIAN ENTOMOLOGIST. 171 



punctate, the dorsal segments somewhat constricted at the 

 sutures and usually delicately margined at apex ; head quad- 

 rate, coarsely punctate Solenius, Lep. et Br. 



[Type S. interruptus, Lep.] 



Front tarsi broadly dilated, the tibiae also dilated and clothed 



witli dense white hairs behind ; middle femora compressed 



into a lamina beneath at base ; abdomen distinctly punctate ; 



head seen from above obtrapezoidal, from in front much 



longer than wide Ceratocolus, Lep. (pars.). 



13. Front tarsi depressed or dilated, the basal joint being depressed or 

 broad and often with a broad lamina or shield-like expansion ; 

 middle tibiae without an apical spur. 



Head normal, almost quadrate; front tarsi depressed but not 

 very broad ; middle legs normal ; antennae with the flagellar 

 joints short, 3-12 with white obtusely rounded, blister-like 

 elevations beneath ; abdomen distinctly punc- 

 tate Hypothyreus, Ashm., n. g. 



[Type C. subterraneus, Fabr.] 

 Head usually much narrowed behind, seen from in front much 

 longer than wide, seen from above obtrapezoidal, the temples 

 very broad but converging behind ; front tarsi broadly dilated, 

 the basal joint with a broad lamina or shield-like expansion 

 and longer than the following joints united. 



Anterior femora and tibiae clothed with a white pubescence 

 beneath, often forming a long flocculus. 



Front tarsal joints emarginate at apex ; antennte with 

 joints 3-5 almost equal, the joints of the flagellum 

 with blister-like elevations beneath. .Thyreus, Lepel. 



[Type C. clypeatus, Sch.] 



Front tarsal joints not emarginate at apex ; antennae 



normal, joints 4-5 equal or nearly, the third 



longer Ceratocolus, Lepel. 



[Type C. alatus, Panz.] 

 14. Antenn;\3 with the joints of the flagellum unusually dilated or broad- 

 ened 17. 



Antennas with the joints of the flagellum slender, not broadened. 



Scrobes bounded by a transverse carina superiorly ; front tarsi 

 with the basal joint depressed and broadened its entire 



